背弃 abandon; betray; desert; renounce 背弃原来的立场 abandon one's original stand; 背弃自己的诺言 go back on one's word; 背弃信仰 renounce one's faith
违约 1.(违反条约、契约) break a contract; violate a treaty 如果这事发生, 他们将会违约。 when this happens, they will tear up the contract.2.(失约) break one's promise; break off an engagement; breach; infringement 我从不违约。 i never break my promise.; 违约当事人 delinquent party; 违约债务人 tardy debtor; defaulting debtor